The exercise was, by and large, peaceful, DGP Neelmani said. A man identified as Subhash Sharma was shot dead by unidentified assailants about 500 metre away from booth no 124 at the Kurtha assembly seat in Arwal district, but the DGP said that it was not related to the elections.

Official sources said Lok Janshakti Party president Ram Vilas Paswan's son-in-law and party nominee Mrinal Paswan was detained together with seven supporters for creating disturbance in a constituency in Rajgir.

Nationalist Congress Party nominee for Jagdishpur Manoj Kumar Rai, was arrested with Rs 21,000 in cash in his possession in Bhojpur district, while former Rashtriya Janata Dal minister Adiyta Singh was arrested for electoral irregularities at a booth in Nawada, the sources said.

Four persons were detained and Rs 1.55 lakh in cash was seized from their vehicle in Phulwari constituency where Janata Dal-United nominee Shyam Razak locked horns with RJD's Uday Manjhi.

Supporters of two rival JD-U and RJD clashed in Biharsharief town. No casualty was reported.

An unexploded landmine was seized from under a bridge at Baragaon under Masaurhi assembly constituency in Patna district, the sources said.

A person was arrested and five country-made pistols were seized from his possession at Arwal.

Five members of a patrol, including a magistrate, were injured when their jeep overturned in Arwal assembly constituency.

A presiding officer suffered cardiac arrest in booth 166 in Biharsharief constituency and was admitted to hospital, the sources said.